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Oct 11, 2024 · Your contact lens diameter should fit comfortably over your cornea, and is typically between 14 to 14.5. PWR/SPH: PWR or SPH stand for power or sphere, respectively. These terms are interchangeable, and they refer to the strength of your prescription. You’ll see a positive or negative number in this field.
Locate the prescription on the side of the box as seen below: Read the measurement of the diameter (DIA), given in millimeters; this is the distance from one edge of the contact lens to the other. Read the power (PWR) of the lens strength (it may be different for each eye), measured in diopters. The higher the power number, the stronger the ...
Here’s the meaning behind each of these letters and numbers on your glasses prescription: 1. OD “oculus dexter” indicates your right eye’s parameters. 2. OS “oculus sinister” shows your left eye’s parameters. 3. SPH “sphere” indicates the amount of lens power prescribed for nearsighted or farsighted vision.
A contact lens prescription will have some information that isn’t just about your contact lens fit. For starters, your name. And with that fact, it’s a good time to drive home the point that a contact lens prescription is tailored to your eyes and your eyes only. Your contact lenses should never be shared with anyone else.
- What Is A Contact Lens fitting?
- What The Abbreviations and Numbers Mean
- Astigmatism Means More Abbreviations
- Your Prescription’S Expiration Date
- Do I Have to Have A Contact Lens prescription?
When you get contacts, your eye doctor will do just a bit more than what is done for an eyeglasses prescriptions. That’s because there are measurements needed for contacts that are different from those of glasses. It’s important to tell your eye doctor you want to wear contact lenses so they can get all the right measurements. The office visit will...
Here are some abbreviations you may see on your contact lens prescriptions. 1. OD: Right eye - used to talk about prescription issues for the right eye 2. OS: Left eye - used to talk about prescription issues for the left eye 3. OU: Each eye - used when both eyes need the same prescription 4. SPH: Sphere - this is the measurement stating how nearsi...
For those with astigmatism, the prescription will also have the following abbreviations. 1. AXIS: Axis - This number is shown with degrees. It identifies the astigmatism correction position with a number from 0 to 180. 2. CYL: Cylinder - This number gives the correction for astigmatism For those with bifocal or multifocal lenses, the prescription w...
Another thing you will see on your contact lens prescription is the expiration date. The expiration date is determined by law. Why by law? Because wearing contacts that have the incorrect prescription can cause eye problems such as: 1. Dryness 2. Irritation 3. Blurry vision Contact prescriptions are only good for one year. Once the year is up, you ...
The answer is yes. You absolutely must have a prescription to order contact lenses because contacts are a medical device. As a medical device, contacts must be made to fit the user, and from approved materials. If they are not, then you won’t see well. Worse yet, you may damage your eyes. For instance, sometimes people buy colored contactsjust for ...
Oct 4, 2023 · The numbers after "x" show the direction of the correction. Reading Help: The last numbers (+2.00 and +2.50) are for presbyopia. As we age, reading up close can get tricky. These numbers show how much extra help is needed for close-up tasks, like reading. The left eye needs more help than the right.
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Apr 6, 2024 · 3. Understand the term add power (ADD). Sometimes, it may be necessary for you to have contact lenses with bifocals in them. If this is the case, your prescription may have a column or row for ADD, which is the amount that the lens needs to be adjusted for the bifocal lenses. This term is measured in diopters.
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